1. 毯子；毛毯
    A blanket is a large square or rectangular piece of thick cloth, especially one which you put on a bed to keep you warm.

2. 覆盖层
    A blanket of something such as snow is a continuous layer of it which hides what is below or beyond it.

    e.g. The mud disappeared under a blanket of snow...
           泥巴被积雪盖住了。
    e.g. Cold damp air brought in the new year under a blanket of fog.
           厚厚的一层雾伴着阴冷潮湿的空气迎来了新的一年。

3. （不好的情感、性质等的）弥漫，充斥
    You can refer to something such as an unpleasant emotion or an undesirable quality that seems to affect every aspect of a particular situation as a blanket of that emotion or quality.

    e.g. It seems as if the blanket of depression is in some way necessary to help them blot out the even greater pain of real life...
           似乎这种弥漫的抑郁情绪多少能帮助他们忘却一些现实生活中更大的痛苦。
    e.g. A blanket of silence descended.
           大家都沉默不语。

4. 覆盖；遮盖；盖住
    If something such as snow blankets an area, it covers it.

    e.g. More than a foot of snow blanketed parts of Michigan...
           密歇根州的部分地区被超过一英尺厚的积雪所覆盖。
    e.g. With a thick mist now blanketing the trees, I got thoroughly lost.
           此时浓雾笼罩着林木，我彻底迷路了。

5. 通用的；全面的；无一例外的
    You use blanket to describe something when you want to emphasize that it affects or refers to every person or thing in a group, without any exceptions.

    e.g. There's already a blanket ban on foreign unskilled labour in Japan.
           日本已经全面禁止国外非熟练工入境。
    e.g. ...the blanket coverage of the Barcelona Olympics.
           对巴塞罗那奥运会的全面报道

6. see also: electric blanket;security blanket;wet blanket